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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27833 results found.

  1. GRB 081129: Fermi GBM detection
  2. Swift Trigger 335971 is probably not a real source
  3. Trigger 335971: Swift possible detection of a burst
  4. GRB081128: Swift/UVOT Upper Limits
  5. SGR 1806-20: Fermi GBM detection.
  6. GRB 081122B: Fermi GBM Detection
  7. GRB 081128: Swift-XRT refined analysis
  8. GRB081128: optical observations
  9. GRB 081128: Swift-BAT refined analysis
  10. GRB 081128: Enhanced Swift-XRT position
  11. GRB 081128: Swift detection of a burst
  12. GRB 081126: Swift observations continuing
  13. GRB081126: Afterglow photometry from Crni Vrh
  14. GRB 081126: GRT Optical Observation
  15. GRB 081127: Swift/UVOT Upper Limits
  16. GRB 081127: Swift-XRT refined analysis
  17. GRB 081127: Enhanced Swift-XRT position
  18. GRB 081126: Confirmation of the Optical Afterglow
  19. GRB 081127: Swift-BAT refined analysis
  20. GRB 081126: Swift-XRT refined analysis
  21. GRB 081127: Swift detection of a burst
  22. GRB 081126: Swift/UVOT Observations
  23. GRB 081126: optical observations
  24. GRB 081126: Swift-BAT refined analysis
  25. GRB 081126: Enhanced Swift-XRT position
  26. GRB 081126: TAROT Calern observatory optical observations
  27. GRB 081126: Swift detection of a burst
  28. GRB 081125: Fermi GBM detection
  29. GRB 081124: Fermi GBM detection
  30. GRB 081120: Fermi GBM detection
  31. GRB 081118: Fermi GBM detection.
  32. GRB 081122: Fermi GBM detection
  33. Konus-Wind observation of GRB 081121
  34. GRB081121: Fermi GBM detection
  35. Fermi GBM detection of a weak source
  36. GRB081121: Refined Swift/UVOT observations
  37. GRB 081121: Swift-XRT refined analysis
  38. GRB 081121: Enhanced Swift-XRT position
  39. GRB 081121: GROND observations
  40. GRB 081121: Swift-BAT refined analysis
  41. GRB081121: Swift/UVOT observations
  42. GRB 081121: Swift detection of a burst
  43. GRB 081121: ROTSE-III Detection of Optical Counterpart
  44. GRB081118 : optical upper limit
  45. GRB 081119: Fermi GBM detection
  46. GRB 081118: Swift-XRT refined analysis
  47. GRB 081118: GROND detection of afterglow
  48. GRB 081118: Swift UVOT Upper Limits
  49. GRB 081118: Swift-BAT refined analysis
  50. GRB 081118: Enhanced Swift-XRT position
  51. GRB 081118: Swift detection of a burst
  52. GRB 081109A: confirmation of possible detection host galaxy
  53. Further Swift-XRT observations of the probable GRB 081105.
  54. GRB 081113: Fermi GBM detection
  55. GRB 081102: RTT150 Optical observations
  56. GRB 081110: Fermi GBM detection
  57. GRB 081109: TAROT La Silla observatory optical observations
  58. GRB 081102: MASTER refind and final results
  59. GRB 081109: GROND redshift limit and host extinction
  60. GRB 081025: Swift-XRT further analysis
  61. GRB 081024B: Swift-XRT late-time observations
  62. Swift-BAT refined analysis of trigger 334129
  63. GRB 081109B: Swift/UVOT refined analysis
  64. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  65. GRB 081109A: Possible Swift-UVOT detection
  66. GRB 081109A, Swift-BAT refined analysis
  67. GRB 081109A: Swift-XRT refined analysis
  68. GRB 081109: Fermi GBM detection
  69. GRB 081109: Swift/UVOT upper limits
  70. Swift-BAT Trigger 334129: possible burst
  71. GRB 081109: REM NIR afterglow detection
  72. GRB 081109: Swift detection of a burst
  73. GRB 081028 - PAIRITEL NIR detection
  74. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  75. SGR 1806-20: Fermi GBM detection
  76. GRB 081102B: Fermi GBM detection
  77. GRB 081105B: Fermi GBM detection
  78. GRB 081107: Fermi GBM detection
  79. GRB 081105: GROND Upper Limits
  80. UVOT/Swift observations of GRB081105
  81. Swift-XRT observations of GRB 081105
  82. GRB 081101B: Fermi GBM detection
  83. GRB 081105 Swift/BAT and IPN Localization
  84. GRB 081025: Fermi GBM observation
  85. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  86. GRB 081104: refined XRT analysis
  87. GRB 081104: Enhanced Swift-XRT position
  88. GRB 081104: Swift-BAT refined analysis
  89. GRB081104: Swift/UVOT Upper Limits
  90. Fermi-GBM detection of a Solar Flare
  91. Fermi Detection of GRB 081102
  92. GRB 081104: Swift-XRT position
  93. GRB 081104: Swift detection of a burst
  94. GRB 081102: MASTER prompt optical limit
  95. GRB 081102: Swift-XRT refined analysis
  96. GRB 081102: Swift/UVOT refined analysis
  97. GRB 081102: Swift-BAT refined analysis
  98. GRB 081102: Enhanced Swift-XRT position
  99. Radio observation of GRB 080218b with ATCA
  100. GRB 081102: MASTER VWF promt observation

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